Sizing Cannondale vs Canyon

[Chain-L]

I am looking at ordering a new bike and need some guidance on sizing please.

 

Canyon.com has an online sizing tool which I used. I did the measurements and at first the system informed me that I required a size 53  frame. I was very surprised, as I thought I would be the same size as my current bike which is a Medium. I then measured again and found some minor differences in inseam and torso and this time I was a 56 cm-medium. Now I am not sure?

 

My current bike is a 54cm Cannondale CAAD 9 which is the correct size.

 

for what its worth, here is my measurments:

Height  177

Inseam 83

Torso 66

Shoulder 46

Arm 62

 

I have compared the geometries of the two bikes and would like your opinion. The figures at the bottom is what I was given when my bike fit was done.